A monument to the center of the North American continent may be off by a few miles.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

The "All-Seeing Eye of God" symbol on this library is a clue to one of the many former lives of this building.

Bizarre Cavern.

Built by the patriotic residents of Boonsboro in a single day.

Time travel with sweets across history at this research-based candy store.

Where serial killer Aileen Wuornos drank her last beer.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

Church and home-museum of a 1920s female revivalist preacher with a very sordid past.

The system of air guns are fired off remotely to scare any trespassing avians.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The school tested mustard gas for the U.S. Army during World War I.

The "Jade Museum" is full of thousands of intricately carved works of art made from various precious stones.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

The birthplace of the Ford Model T is now a museum full of antique cars.

This unique collection collects pieces of art etched into thin pieces of stone.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

D.C. once had its own tiny rival to the New York Stock Exchange.

Where the U.S. government kept its actual treasure, before Fort Knox.

A line of blue paint marks the route of the inaugural parade.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

The United States Capitol's former columns still stand.